High Pressure PTFE Wedge Mechanical Seal for Mixers

The high pressure PTFE wedge mechanical seal for mixers, specifically engineered for top-entry agitators, reactor shafts and mixing vessels operating under demanding conditions. This high pressure mechanical seal features a balanced design rated to 40 bar vessel pressure, with an extended PTFE wedge that tracks radial shaft runout up to 0.5 mm, ensuring reliable sealing even under shaft deflection common in mixer applications.

Model:59B

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Key Features

• Agitator-Specific Design: Accommodates larger radial runout (up to 0.5mm) compared to standard pump seals.

• High-Pressure Capability: The balanced design of this high pressure mechanical seal is capable of holding vessel pressures up to 40 bar during reaction cycles.

• Dry-Run Options: This ptfe mechanical seal can be configured with special carbon faces for top-entry mixers where the seal operates in the gas phase.

• Extended PTFE Wedge: Features a longer wedge profile to maintain sealing integrity even when the shaft wobbles.

• Bearing Support (Optional): Can be integrated with a steady bearing to provide additional shaft support and protect the seal faces.

Technical Specs		Materials
Mediums	Petroleum, chemical solvents, medium corrosion.	Stationary Ring	Ceramic/Sic/TC
Temperature	30℃ to 200℃	Rotary Ring	Carbon/Sic/TC
Pressure	≤2.5MPa	Secondary Seal	PTFE
Speed	≤25m/s	Spring and Metal Part	Stainless Steel

Product Specifications

Metric Shaft Size D1	Size Code	D2	D3	D7	L1	L4	L3
14	0140	18	32	25	30.7	12	6
16	0160	20	34	27	30.7	12	6
18	0180	22	36	33	31.7	13.5	6.5
20	0200	24	38	35	31.7	13.5	6.5
22	0220	26	40	37	31.7	13.5	6.5
24	0240	28	42	39	34.4	13.5	6.5
25	0250	30	44	40	34.7	13	7
28	0280	38	47	43	37.7	12.5	7.5
30	0300	35	49	45	38.2	12	8
32	0320	38	54	48	38.2	12	8
33	0330	38	54	48	38.2	12	8
35	0350	40	56	50	38.2	12	8
38	0380	43	59	56	39.7	13	10
40	0400	45	61	58	39.7	13	10
43	0430	48	64	61	39.7	13	10
45	0450	50	66	63	39.7	13	10
48	0480	53	69	66	39.7	13	10
50	0500	55	71	70	44.2	13.5	11.5
53	0530	58	78	73	44.2	13.5	11.5
55	0550	60	80	75	44.2	13.5	11.5
58	0580	63	83	78	49.2	13.5	11.5
60	0600	65	85	80	49.2	13.5	11.5
63	0630	68	88	83	49.2	13.5	11.5
65	0650	70	90	85	49.2	13.5	11.5
70	0700	75	95	92	55.7	14.5	13.5
75	0750	80	104	97	55.7	14.5	13.5
80	0800	85	109	105	55.2	15	13
85	0850	90	114	110	60.2	15	13
90	0900	95	119	115	60.2	15	13
95	0950	100	124	120	60.2	15	13
100	1000	105	129	125	60.2	15	13

Workshop

This workshop is equipped with professional processing equipment and integrated with standardized material warehousing management, enabling a one-stop production process from precision machining of ptfe mechanical seal components to finished product delivery. Dedicated production lines for each high pressure mechanical seal model ensure part machining accuracy and production efficiency, meeting various high-specification manufacturing requirements for chemical reactor, autoclave and high-pressure mixing applications.

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Product Research, Development and Testing

Our Product R&D and Testing focuses on optimizing ptfe mechanical seal performance through advanced simulation and material analysis. Every high pressure mechanical seal undergoes rigorous trials, including thermal cycling and pressure tests, to ensure durability, minimal leakage, and long service life in demanding industrial environments such as chemical reactors, autoclaves and high-pressure mixing vessels.

Industry Solutions

Case Study

Polymerization Reactor: A high-pressure reactor (30 bar) was leaking toxic monomers. Standard seals failed due to shaft deflection. We installed this High-Pressure PTFE Wedge Seal. Its robust tracking ability handled the movement, maintaining a zero-leak environment.

Testimonials

The shaft wobble on our old mixer destroyed every seal until we tried this one. It's built like a tank.

—Maintenance Supervisor, Plastics Manufacturer

FAQs

Q: Can this run dry in the vapor space?

A: Yes, if equipped with our special Dry-Running Carbon face material. However, for high pressures, we often recommend a double seal with a liquid barrier for cooling.

Q: What makes this seal suitable for mixer and agitator applications?

A: This high pressure mechanical seal is specifically designed for top-entry mixers and reactor agitators where shaft runout and vibration are common. The extended PTFE wedge tracks radial shaft movement up to 0.5 mm, maintaining consistent face contact even under shaft deflection. An optional steady bearing provides additional support to protect seal faces from excessive vibration. Dry-run carbon face options are also available for gas-phase or partial-dry mixer service.

Q: What are the maximum operating limits for this PTFE wedge mechanical seal?

A: The Model 59B balanced design handles vessel pressures up to 40 bar, with a sealed pressure rating of 2.5 MPa. Temperature range is -30°C to 200°C, and maximum sliding speed is 25 m/s. Face material combinations include Carbon vs Ceramic, Silicon Carbide vs Silicon Carbide, or Tungsten Carbide vs Silicon Carbide, selected based on media corrosiveness, abrasiveness and temperature.

Q: Can this seal be customized for my existing mixer or reactor shaft?

A: Yes. As a leading OEM manufacturer, MIAOYU offers full customization. We accept your shaft diameter, bore size, working pressure, temperature and media details to produce a tailor-fit seal. OEM/ODM services include custom branding, packaging and drawings. Standard lead time is 7–15 working days with 24-hour quotation response. All seals undergo thermal-cycle and pressure testing before shipment.